no
yes, you pretty much ALWAYS need a stamp to send a letter in the mail. :)
Yes. Every letter mailed in the US needs a stamp.
Yes, you do need a stamp wherever you post anything.
3 Just one stamp will do it for a normal letter.
The stamp has to be accepted where you mail the letter. If you are mailing in Canada, you need a Canadian stamp. If you are in the US mailing to Canada, you can use a US stamp.
About one liberty stamp :)
The reason you need a stamp to mail a letter is because the stamp is the proof that you paid for your letter to be delivered. Instead of paying the mailman directly, and waiting for him to come to your house so you can pay the mailman to deliver your mail, the stamp proves that you paid for the delivery of the mail.
No of course not! you'd need an airmail stamp.
an address, a postage stamp and a letter to stick it to.
Unfortunately not
Yes, you do